渤海中深部地层多源信息一体化压力监测方法

A pressure monitoring method integrating multi-source information in middle and deep formations in Bohai Sea

地层压力是影响钻井工程安全的关键问题。传统欠压实地层压力监测方法受到人工操作因素、井筒钻具因素影响导致系统误差大、监测结果精度低。通过对历史井数据、随钻获得的测井、录井、钻井数据归纳表达和描述,建立基于历史源的分析过程参数和结果参数库,通过钻头破岩效率分析剔除产生的异常噪点影响,通过气测响应特征分析建立井筒压力关系映射特征,通过井筒动态压力精细刻画,建立了三类关系约束模型,最终建立了多源信息的地质工程一体化压力分析工作流程。2017-2020年在32口井的应用实践表明,该方法预测精度可达94%以上,证明了该技术具有较好的实用性和推广价值。

Formation pressure is a key issue affecting the safety of drilling engineering.The traditional under-compacted formation pressure monitoring method is affecting by manual operation factors and well drilling tools,resulting in large systematic errors and low monitoring accuracy.Through the generalization and description of historical well data and logging,drilling data obtained while drilling,a library of analysis process parameters and result parameters based on historical sources was established.Eliminate the influence of the data generating abnormal noise through analyzing the rock breaking efficiency of drill bit.Establish the mapping characteristics of well pressure relationship through analyzing gas logging response characteristics.Establish a constraint model on three types of relationship through finely characterizing well dynamic pressure.And finally,establish a pressure analysis workflow integrating multi-source information from geology and engineering.The application practice in 32 wells from 2017 to 2020shows that the prediction accuracy of this method can reach more than 94%,which proves that there are favorable practicability and promotion value for this technique.